@Cinta have you tried castor beans? This is my first year, and yes they're poisonous but perfectly legal! Until you deliberately kill someone with them. In that case Forensic Files tells me that arsenic and cyanide are the way to go.
I have green and also purple. The green is about 2 ft taller, the purple has gigunda leaves. Definitely would give you shade and something to talk about too. AND tropical!
